Material handling vehicle
First Claim
1. A material handling vehicle comprising a structure having ground engageable propulsion means;
- material handling apparatus mounted on the structure for movement relative thereto including a first part and a second part;
a first fluid operated actuator operable to move the first part relative to the structure and a second fluid operated actuator operable to move the second part relative to the first part;
an operator control operable to generate a fluid pressure control signal;
a first control valve operable to supply fluid pressure to said first actuator in response to said fluid pressure control signal and a second control valve operable to supply fluid pressure to said second actuator in response to said fluid pressure control signal;
a modulating valve operable to vary said fluid pressure control signal;
an electronic control unit operable to control said modulating valve in accordance with a desired operation of the material handling apparatus, and wherein a fluid pressure control signal must be generated to permit operation of said first actuator and said second actuator.
1 Assignment
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Accused Products
Abstract
A material handling vehicle including a structure having ground engageable propulsion means and material handling apparatus mounted on the structure for movement relative thereto. The material handling apparatus has a first part and a second part. A first fluid operated actuator moves the first part relative to the structure, and a second fluid operated actuator moves the second part relative to the first part. An operator control generates a fluid pressure control signal. A first control valve supplies fluid pressure to the first actuator, a second control valve supplies fluid pressure to the second actuator in response to the fluid pressure control signal, and a modulating valve varies the fluid pressure control signal. An electronic control unit operable to control the modulating valve in accordance with a desired operation of the material handling apparatus.
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Citations
14 Claims
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1. A material handling vehicle comprising a structure having ground engageable propulsion means;
- material handling apparatus mounted on the structure for movement relative thereto including a first part and a second part;
a first fluid operated actuator operable to move the first part relative to the structure and a second fluid operated actuator operable to move the second part relative to the first part;
an operator control operable to generate a fluid pressure control signal;
a first control valve operable to supply fluid pressure to said first actuator in response to said fluid pressure control signal and a second control valve operable to supply fluid pressure to said second actuator in response to said fluid pressure control signal;
a modulating valve operable to vary said fluid pressure control signal;
an electronic control unit operable to control said modulating valve in accordance with a desired operation of the material handling apparatus, and wherein a fluid pressure control signal must be generated to permit operation of said first actuator and said second actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- material handling apparatus mounted on the structure for movement relative thereto including a first part and a second part;
Specification